what is our stock gear ratio....and where can you look to perhaps see if you rear end ratio is not stock.


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1990 Firebird 3.1
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- Auto Trans, TA Body Kit
- Home Made C.A.I.
- ASP Underdrive Pulleys
- MSD 8.5mm Superconducter Wires (custom-cut)
- MSD GM Blaster Coil
- AC Delco Cap & Rotor
- Bosh Platinum +4 plugs
- Mobil 1 Synthetic Fluids
- 2.5" Hooker Aero-Chamber Cat-back
- 2.5" Hooker Elite Stainless Extension Tips
- GTS Blackouts (stickers removed)
- TB Bypass

KILLS = Dodge Daytona (stick), 2000 Toyota 4 Runner 4WD,
1997ish Ford Explorer, "older" Jeep Cherokee (don't ask why they are all SUVs...who the hell knows?)

LOSSES = 300zx (had him half way through 2nd, he was manual)

"The racing dice added 5hp...I SWEAR!"

 

Not stock, look at the back gear cover. You may notice some goo oozing out from cover from a rebuild.
Stock may be a 3:23.
My 1985 is a stock 3:42, non-posi, DRAT!
Love the gears, hate the peg leg burnouts

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

1990-1992 Automatics got 3.23's.
1990-1992 5 speeds got 3.42's.
198?-1989 all got 3.42's.

 

It's messy, but you can pull off the rear cover & count the teeth of the ring gear & pinion gear, then divide 'em. Might be a good idea anyway, your rear fluid's probably never been changed.

If you luck out, there's a 3-digit code stamped on the FRONT of the passenger side axle tube. The Haynes manual lists some of the codes in it; that code will tell you the rear gear, and if you have a posi or not. The code #'s hard to see, you'll need a wire brush & wet rag to pick up on it.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
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